Perry's Index to the Aesopica
Fables exist in many versions; here is one version in English:
THE HARES AND THE FOXES
The hares were at war with an eagle and they asked the foxes to be their allies.
The foxes said in reply, 'We would agree to be your allies, if we didn't know
what sort of creatures you are and who you are fighting against!'
This fable indicts people who attack someone who is more powerful than they
are and thus bring ruin upon themselves.
Aesop's Fables. A new translation by Laura
Oxford University Press (World's Classics): Oxford, 2002.
cover, with new ISBN, published in 2008; contents of book unchanged.
Perry 256: Gibbs (Oxford) 51 [English]
Perry 256: L'Estrange 187 [English]
Perry 256: Townsend 172 [English]
Perry 256: Chambry 190 [Greek]
Perry 256: Syntipas 22 [Greek]
You can find a compilation of Perry's index to the Aesopica in the gigantic appendix to his
edition of Babrius and Phaedrus for the Loeb Classical Library
(Harvard University Press: Cambridge, 1965). This book is an absolute must for anyone interested
in the Aesopic fable tradition. Invaluable.